CN102809168A - Air preheater and application thereof - Google Patents
Air preheater and application thereof Download PDFInfo
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- CN102809168A CN102809168A CN2011101450986A CN201110145098A CN102809168A CN 102809168 A CN102809168 A CN 102809168A CN 2011101450986 A CN2011101450986 A CN 2011101450986A CN 201110145098 A CN201110145098 A CN 201110145098A CN 102809168 A CN102809168 A CN 102809168A
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- regenerator
- air preheater
- heat storage
- flue gas
- storage medium
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
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Abstract
The invention discloses an air preheater, which comprises at least two heat accumulation chambers, wherein hot flue gas inlets are formed in the heat accumulation chambers; the heat accumulation chambers are provided with condensed fluid and cold flue gas outlets; cold air inlets and hot air outlets are formed in the heat accumulation chambers; and heat accumulation media are filled in the heat accumulation chambers. According to the air preheater, the thermal efficiency of a heating furnace is improved to over 94 percent while the temperature of flue gas is reduced to be less than a dew point of acid; and simultaneously, acidic water, ash and other pollutants are recovered and condensed, so that the corrosion of equipment is delayed.
Description
Technical field
The present invention relates to the flue gas waste heat recovery technical field, particularly a kind of regenerative air preheater.
Background technology
Flame heating furnace is a widely used technology heating furnace in petroleum refining, petrochemical industry and chemistry, the chemical fibre industry, is fuel with fuel oil or combustion gas, the direct heating tube inner fluid of flame.At present, the flame heating furnace exhaust gas temperature is generally higher, and generally at 130 ℃～180 ℃, what have may surpass 200 ℃, and the thermal efficiency is usually about 90%.Also have a large amount of physics sensible heats not utilize in the flue gas, the more important thing is, owing to contain a large amount of steam in the flue gas that fuel oil and fuel gas buring produce, its latent heat of vaporization is discharged with flue gas, causes very macro-energy waste.Simultaneously, the SO in the flue gas
2, SO
3, CO
2, pernicious gas content such as NOx is higher relatively, and is also relatively more serious to the pollution that environment produces.
In flame heating furnace, the acid dew piont corrosion of flue gas is to stop one of further key factor that improves of thermal efficiency of heating furnace.In the present circumstance, the fuel oil of many enterprises and fuel gas also do not have complete desulfurization, and the acid dew point of flame heating furnace institute smoke discharging is very high, and is about 110 ℃～140 ℃, that have even higher usually.The situation of the air preheater generation low-temperature dew point corrosion in the residual neat recovering system happens occasionally.。
Chinese patent ZL 200610017305.9 has proposed a kind of novel flame heating furnace; Comprise heating furnace body and residual neat recovering system; Residual neat recovering system comprises air preheater, and wherein air preheater is made up of for two sections on-condensing air preheater and condensing air preheater.Propose for the first time the notion of condensing air preheater in this patent, reclaimed the latent heat that the part water vapour condensation in the flue gas discharges.But the content that does not relate to regenerative air preheater.
Chinese patent ZL 200710118107.6 has proposed a kind of condensation type heat-storage type gas-firing boiler system, arranges U type combustion chamber in the boiler body drum, and U type combustion chamber tube two ends symmetry connects the heat accumulating type neat gas burner of alternation.The metal fin pipe that its flue gas condensing heat exchanger is a serpentine configuration, the preboiler feedwater.Therefore, the flue gas condensing heat exchanger of this patent is the non-condensing regenerative air preheater.
Chinese patent ZL 200710118450.0 is with the boiler characteristic that Chinese patent ZL 200710100357.7 proposes: body of heater is provided with a plurality of burners; Described burner is provided with high temperature combustion air inlet and fuel entrance; Said high temperature combustion air inlet is connected with regenerator; Described regenerator is connected with normal temperature combustion air inlet and low-temperature flue gas inlet; Described low-temperature flue gas outlet is connected with the condensation heat recover, is provided with condensate pipe in the described condensation heat recover, utilizes condensed water as condensing agent.Therefore, its condensation heat recover is the non-condensing regenerative air preheater.
Han Xiaoyan; Li Jie is at Liaoning Technical University's journal 2009; Deliver the article that is entitled as the application of Regenerative Combustion Technology on the oil plant heating furnace on 29 (5); Introduced the basic principle of high-temperature heat accumulation combustion technology, traditional oil plant heating furnace and recuperative heater have been carried out the calculating of the fuel oil consumption and the thermal efficiency etc. respectively, and result of calculation has been carried out the energy-saving benefit analysis.This article stresses that exhaust gas temperature should not be lower than the dew-point temperature of flue gas in order to reduce dew point corrosion.The content that does not relate to flue gas condensation in regenerator.
Zhang Chengjun writes, Shanghai Tongji University publishing house, and 1995 " principle of air preheater and the calculating " of publishing have been introduced the characteristics of regenerative air preheater: heat storage is set as heat-transfer area in preheater.Heat storage can constitute by stopping particle admittedly, or is made up of refractory material, metal lath etc.The fluid that it is to carry out heat exchange with the difference of general dividing wall type preheater is not in passage separately, to absorb or emit heat, but alternately utilizes heat storage to absorb through same passage or emit heat.Heat exchange divides two stages to carry out: hot fluid was emitted heat through heat storage before this, and heat storage then is heated and heat is saved.Be that cold fluid flows through heat storage absorption heat then, heat storage is cooled, and repeats said process, and heat exchange is carried out continuously.Because the mobile of cold fluid and hot fluid be continuous, flow all uninterruptedly for making with heat exchange, must have to have two covers heat storage passage arranged side by side in two cover equipment arranged side by side or the same equipment and work simultaneously.
Only solved the accumulation of heat problem that reduces hot gas temperature in the prior art air preheater, do not solved flue gas condensation in regenerator and discharge the latent heat preheated air, hot-air is used for the problem of heating furnace burning.
Summary of the invention
To reclaim the existing defective of fume afterheat in the prior art in order overcoming, to the present invention proposes a kind of air preheater, utilize heat storage medium to absorb flue gas heat; To steam partial condensation wherein simultaneously; Heat is stored in the heat storage medium, and condensate liquid and cold flue gas are discharged, then with other media of the heat in the heat storage medium; Not only improve the thermal efficiency, also solved the equipment corrosion problem.
The present invention proposes a kind of air preheater, comprises regenerator, and regenerator is provided with hot gas approach; The cold outlet of condensate liquid and flue gas; On regenerator, also be provided with inlet of cold air and hot air outlet, it is characterized in that: have two regenerator at least, be filled with heat storage medium in the regenerator.
Described hot gas approach is arranged on regenerator top, and the regenerator bottom is provided with condensate liquid and exhanst gas outlet.
Described hot gas approach is arranged on the regenerator top, and regenerator bottom is provided with condensate liquid and exhanst gas outlet.
Described heat storage medium is the solid heat storage medium, preferred porcelain, pottery, pottery or cast iron materials, especially Ceramic Balls or ceramic honey comb, Cast-iron Ball or honeycomb cast iron.
The equivalent diameter of described heat storage medium is 3～50mm.
Described a plurality of regenerator is for being set up in parallel.
The present invention proposes a kind of air preheater, it is characterized in that: regenerator top is provided with water flushing coil pipe, and water flushing coil pipe is the acid-alkali-corrosive-resisting pipe, and flushing water is an alkaline water.
The invention allows for a kind of application of air preheater, temperature is introduced regenerator at 110～200 ℃ of flue gases from the top of one in air preheater, 50～95 ℃ cold flue gas and condensate liquid are discharged from the regenerator bottom.
The application of said a kind of air preheater is characterized in that: preferred 50～450Pa falls 1～500Pa, in the flow through pressure of regenerator of flue gas.
Compared with prior art the present invention has the following advantages:
1) owing to utilizes materials such as Ceramic Balls or ceramic honey comb as heat storage medium; They have heatproof, the corrosion of water-fast, anti-flue gas acid dew point and the big characteristics of amount of stored heat; As the heat storage medium of regenerative air preheater, the flue-gas temperature that gets into air preheater is dropped to below the acid dew-point temperature, even about 70 ℃; The fully sensible heat of release flue gas and wherein water vapour condensation latent heat are brought up to more than 94% the thermal efficiency of heating furnace;
2) accumulation of heat and heat release are integrally formed, through utilizing the not only heat absorption of flue gas of heat storage medium, the pollutant condensation is got off but also general's harmful acid water, ash wherein grades.
3) reclaim acid water, ash that condensation the gets off pollutant that grades, thoroughly solve the low-temperature dew point corrosion problem of normal air preheater, really do energy-saving and emission-reduction.
Accompanying drawing and description of drawings
Below the accompanying drawing illustrative the present invention, but do not limit the scope of the invention.
Fig. 1 is condensation regenerative air preheater state 1 sketch map of the present invention, regenerator A accumulation of heat, regenerator B heat release;
Fig. 2 is condensation regenerative air preheater state 2 sketch mapes of the present invention, regenerator A heat release, regenerator B accumulation of heat;
Fig. 3 is condensation regenerative air preheater state 1 a band water flushing sketch map of the present invention, regenerator A accumulation of heat, regenerator B heat release.
Among the figure:
1. hot flue gas triple valve, 2. regenerator A, 3. regenerator A smoke inlet, 4. regenerator A air outlet slit, 5. regenerator A heat storage medium; 6. regenerator A air intake, 7. regenerator A housing, 8. regenerator A cold flue gas outlet, 9. regenerator A condensate outlet, 10. regenerator A condensate liquid collecting pit; 11. regenerator A exhaust pass, 12. cold flue gas triple valves, 13. regenerator B exhaust pass, 14. regenerator B condensate liquid collecting pits, 15. regenerator B condensate outlets; 16. regenerator B exhanst gas outlet, 17. regenerator B housings, 18. regenerator B air intakes, 19. regenerator B heat storage mediums; 20. regenerator B air outlet slit, the hot smoke inlet of 21. regenerator B, 22. regenerator B, 23. hot-air triple valves; 24. the cold air triple valve, 25. hot flue gases, 26. hot-airs, 27. cold airs; 28. cold flue gas, 29. condensate liquids, 30. regenerator A water cleaning hoses, 31 regenerator B water cleaning hoses.
The specific embodiment
Fig. 1 is a kind of air preheater state 1 sketch map of the present invention; Regenerator A accumulation of heat; Regenerator B heat release; Regenerator 2 is made up of for diameter 15mm porcelain ball, regenerator A air intake 6, regenerator A cold flue gas outlet 8, regenerator A condensate outlet 9, regenerator A condensate liquid collecting pit 10, regenerator A exhaust pass 11 and cold flue gas triple valve 12 housing 7, hot flue gas triple valve 1, regenerator A smoke inlet 3, regenerator A air outlet slit 4, regenerator A heat storage medium 5; Regenerator A smoke inlet 3 is arranged on that regenerator A top, regenerator A air outlet slit 4 are arranged on regenerator A top, regenerator A air intake 6 is arranged on regenerator A bottom, and regenerator A cold flue gas outlet 8 is arranged on that regenerator A bottom, regenerator A condensate outlet 9 are arranged on regenerator A bottom, regenerator A exhaust pass 11 links to each other with cold flue gas outlet 8.
By 160 ℃ hot flue gases from by hot flue gas triple valve 1 through regenerator A gas approach 2 and regenerator A smoke inlet 3; Enter into heat storage medium 5 and be diameter 15mm porcelain ball regenerator A; 200Pa falls in the pressure of regenerator; Temperature is reduced to 65 ℃ cold flue gas 28 through exhaust pass 11 and 12 dischargings of cold flue gas triple valve, and the part water vapor condensation in the flue gas gets off simultaneously, and dissolving part SO
2, SO
3Form condensate liquid with NOx, condensate liquid is discharged through regenerator A condensate outlet 9 and is fallen into condensate liquid collecting pit 10.When regenerator A carries out accumulation of heat; Regenerator B carries out the exothermic process that undertaken by air; Cold air 27 gets into regenerator B through triple valve 24 controls through regenerator B air intake 18; After absorbing the heat of heat storage medium 19 in the regenerator B, get into hot-air triple valve 23, under the control of hot-air triple valve 23, leave air preheater through regenerator B air outlet slit 20.
Fig. 2 is a kind of condensation regenerative air preheater state 2 sketch mapes of the present invention, regenerator A heat release, regenerator B accumulation of heat.The running of hot flue gas and cold air is identical with the mode of Fig. 1.
State when state shown in Figure 3 is condensation regenerative air preheater state of the present invention 1 band water flushing; Regenerator A accumulation of heat; Regenerator B heat release at this moment, causes heat storage medium 5 exhaust gases passes in the regenerator A to stop up for preventing the flue gas dust stratification; Every at a distance from some cycles, water is through regenerator A water cleaning hose 25 flushing heat storage mediums 5; Perhaps in the acid water that produces with flue gas condensing, adopt alkaline water, limewash for example is through regenerator A water cleaning hose 25 spray heat storage mediums 5.
In like manner; For state when condensation regenerative air preheater state 2 band water wash, regenerator A heat release, regenerator B accumulation of heat; At this moment; For preventing that the flue gas dust stratification from causing heat storage medium 19 exhaust gases passes in the regenerator B to stop up, every at a distance from some cycles, water is through regenerator B water cleaning hose 26 flushing heat storage mediums 19; Perhaps in the acid water that produces with flue gas condensing, adopt alkaline water, limewash for example is through regenerator A water cleaning hose 26 spray heat storage mediums 19.
Claims (15)
1. an air preheater comprises regenerator, and regenerator is provided with hot gas approach; Regenerator is provided with condensate liquid and cold flue gas outlet; On regenerator, also be provided with inlet of cold air and hot air outlet, it is characterized in that: have two regenerator at least, be filled with heat storage medium in the regenerator.
2. according to the described a kind of air preheater of claim 1, it is characterized in that: described hot gas approach is arranged on regenerator top, and the regenerator bottom is provided with condensate liquid and exhanst gas outlet.
3. according to the described a kind of air preheater of claim 1, it is characterized in that: described hot gas approach is arranged on the regenerator top, and regenerator bottom is provided with condensate liquid and exhanst gas outlet.
4. according to the described a kind of air preheater of claim 1, it is characterized in that: described heat storage medium is the solid heat storage medium.
5. according to the described a kind of air preheater of claim 1, it is characterized in that: the equivalent diameter of described heat storage medium is 3～50mm.
6. according to the described a kind of air preheater of claim 1, it is characterized in that: described heat storage medium is at least a kind of in the material that porcelain, pottery, pottery and metal material process.
7. according to the described a kind of air preheater of claim 1, it is characterized in that: described heat storage medium is porcelain ball, Ceramic Balls or ceramic honey comb.
8. according to the described a kind of air preheater of claim 1, it is characterized in that: described heat storage medium is Ceramic Balls or ceramic honey comb.
9. according to the described a kind of air preheater of claim 1, it is characterized in that: described heat storage medium is Cast-iron Ball or honeycomb cast iron.
10. according to the described a kind of air preheater of claim 1, it is characterized in that: described a plurality of regenerator are for being set up in parallel.
11., it is characterized in that: be provided with water flushing coil pipe in the regenerator heat storage medium according to the described a kind of air preheater of claim 1.
12. according to the described a kind of air preheater of claim 1, it is characterized in that: the water flushing coil pipe that is provided with in the regenerator heat storage medium is the acid-alkali-corrosive-resisting pipe.
13. the application of an air preheater is characterized in that: temperature is introduced regenerator at 110～200 ℃ flue gas from the top of air preheater, and 50～95 ℃ cold flue gas and condensate liquid are discharged from the regenerator bottom.
14. according to the application of the said a kind of air preheater of claim 13, it is characterized in that: the flow through pressure of regenerator of flue gas is reduced to 1～500Pa.
15. according to the application of the said a kind of air preheater of claim 13, it is characterized in that: the flow through pressure of regenerator of flue gas is reduced to 50～450Pa.
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|---|---|---|---|
| CN2011101450986A CN102809168A (en) | 2011-06-01 | 2011-06-01 | Air preheater and application thereof |
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|---|---|---|---|
| CN2011101450986A CN102809168A (en) | 2011-06-01 | 2011-06-01 | Air preheater and application thereof |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103712491A (en) * | 2014-01-08 | 2014-04-09 | 重庆大学 | Tube type and heat storage type combined heat exchanger based on high-low-temperature segmented heat exchange |
| CN103940275A (en) * | 2013-01-18 | 2014-07-23 | 北京神雾环境能源科技集团股份有限公司 | Gas heat exchanger and gas heat exchange system with same |
| CN105091019A (en) * | 2015-07-22 | 2015-11-25 | 洛阳三信石化设备有限公司 | Deep energy-saving air preheater |
| CN105299687A (en) * | 2015-10-12 | 2016-02-03 | 国家电网公司 | Heat accumulating-type heat exchanger capable of removing dust and nitric oxide in smoke simultaneously |
| CN107490014A (en) * | 2017-08-09 | 2017-12-19 | 华电电力科学研究院 | A kind of recuperative heat exchanger coal unit flue gas cool-down water intake system |
| CN109185907A (en) * | 2018-08-15 | 2019-01-11 | 华电电力科学研究院有限公司 | A kind of power station with smoke aerosol plume cancellation element and system and working method |
| CN112484546A (en) * | 2020-10-19 | 2021-03-12 | 桂林电子科技大学 | Medium-low temperature thermochemical cycle energy storage system based on calcium-based adsorbent and method thereof |
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| CN1793766A (en) * | 2006-01-05 | 2006-06-28 | 中国石油化工集团公司 | Tube type heating furnace |
| CN201145502Y (en) * | 2007-12-27 | 2008-11-05 | 中冶东方工程技术有限公司上海分公司 | Heat accumulated type heat exchanger |
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2011
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| GB1353550A (en) * | 1970-12-22 | 1974-05-22 | Nippon Kokan Kk | Method and regenerative heat exchange system for heating combustible gas |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103940275A (en) * | 2013-01-18 | 2014-07-23 | 北京神雾环境能源科技集团股份有限公司 | Gas heat exchanger and gas heat exchange system with same |
| CN103940275B (en) * | 2013-01-18 | 2017-02-08 | 北京神雾环境能源科技集团股份有限公司 | Gas heat exchanger and gas heat exchange system with same |
| CN103712491A (en) * | 2014-01-08 | 2014-04-09 | 重庆大学 | Tube type and heat storage type combined heat exchanger based on high-low-temperature segmented heat exchange |
| CN105091019A (en) * | 2015-07-22 | 2015-11-25 | 洛阳三信石化设备有限公司 | Deep energy-saving air preheater |
| CN105299687A (en) * | 2015-10-12 | 2016-02-03 | 国家电网公司 | Heat accumulating-type heat exchanger capable of removing dust and nitric oxide in smoke simultaneously |
| CN107490014A (en) * | 2017-08-09 | 2017-12-19 | 华电电力科学研究院 | A kind of recuperative heat exchanger coal unit flue gas cool-down water intake system |
| CN109185907A (en) * | 2018-08-15 | 2019-01-11 | 华电电力科学研究院有限公司 | A kind of power station with smoke aerosol plume cancellation element and system and working method |
| CN109185907B (en) * | 2018-08-15 | 2023-10-20 | 华电电力科学研究院有限公司 | Device and system for eliminating smoke plume of power station and working method |
| CN112484546A (en) * | 2020-10-19 | 2021-03-12 | 桂林电子科技大学 | Medium-low temperature thermochemical cycle energy storage system based on calcium-based adsorbent and method thereof |
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Application publication date: 20121205 |